They are already a nice shade of silver.
I know the shade of silver you are talking about for those 6 wheels, I would love to get a set for our CX-5. Think they would look great on the black body.
Her car, her choice on the wheels. See my first post above. I find it ironic she wants them dark when she gave me such grief about the bronze wheels I used to run on the Miata (and yes, I reminded her of that because I like to live on the edge).